package socket;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;

/**
 * 聊天室的服务器
 */
public class Server2 {
    /*运行在服务器的ServerSocket的主要任务：
    1.向服务端申请服务端口，客户端就是通过该端口与服务器建立连接
    2.监听服务端口，一旦一个客户端连接了就会立即创建一个Socket实例与之交汇
    我们将SeverSocket比喻为某客服中心的“总机”
     */
    private ServerSocket serverSocket;
    public Server2(){

        try {
            System.out.println("正在启动服务器");
            serverSocket=new ServerSocket(9991);
            System.out.println("服务端启动完毕");
        }catch (IOException e){
            e.printStackTrace();
        }
    }

    public void start(){


            try {
                while (true) {
                    System.out.println("等待客户连接");
                    Socket socket = serverSocket.accept();
                    System.out.println("客户端已连接上了");

                    ClientHandler handler=new ClientHandler(socket);
                    Thread t=new Thread(handler);
                    t.start();

                }

            }catch (IOException e){
                e.printStackTrace();
            }

    }

    public static void main(String[] args) {
        Server2 server=new Server2();
        server.start();
    }

    /*
    该线程任务负责与指定的客户端交互
     */
    private class ClientHandler implements Runnable{
        private Socket socket;
        private String host;
        public ClientHandler(Socket socket){
            this.socket=socket;

            host=socket.getInetAddress().getHostAddress();
        }
        public void run(){
            try {
                InputStream in = socket.getInputStream();
                InputStreamReader isr = new InputStreamReader(in, StandardCharsets.UTF_8);
                BufferedReader br = new BufferedReader(isr);

                String massage;
                while ((massage = br.readLine()) != null) {
                    System.out.println(host+"客户端硕：" + massage);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            }
        }
    }

